Ubuntu 10.04 Post-Install Guide: What to do and try after installing Lucid Lynx

Now that you've installed Ubuntu 10.04, Lucid Lynx, a kickass GNU+Linux based free desktop operating system, there's a lot of fun stuff waiting for you to try! This guide lists good things to do after installing Ubuntu, explains new concepts for beginners, and doubles as a very complete list of great software to use aimed at Ubuntu's GNOME desktop environment. Feel free to pick and choose; enjoy!